task/ansible: disable color output
task/ansible: disable color output

This was messing up all logs with ANSI
codes.

Signed-off-by: John Spray <a0ab4ec42db5a70bbcbfc74d8971c0305528d92b@redhat.com>

SUSE/teuthology,ktdreyer/teuthology,SUSE/teuthology,dmick/teuthology,ktdreyer/teuthology,dmick/teuthology,SUSE/teuthology,dmick/teuthology,ceph/teuthology,ceph/teuthology